Use Swift subscripts in objective-C

Question

I have declared a subscript in swift and wanted to know if it is possible to use a swift subscript in objective-c ? Because I have made my class inherit from NSObject and made the subscript public. But I still cannot have access to it. I am asking this question based on this line in the Apple's "Using Swift with Cocoa and Objective-C" :

How to make the subscript compatible to Objective-C or is Swift subscripts is a specific swift feature ?

Sulthan · Accepted Answer · 2016-07-18 19:33:49Z

4

It is absolutely possible, see:

class MyArray : NSObject {
    var data: [Int] = [0, 1, 2]

    subscript (index: Int) -> NSNumber {
        return data[index]
    }
}

Obj-C:

MyArray *array = [[MyArray alloc] init];
NSNumber *value = array[0];

There are some limitations though. You cannot return a primitive value (Int), you have to return an Obj-C object, e.g. NSNumber.

edited Jul 18, 2016 at 19:33

answered Jul 18, 2016 at 19:25

Sulthan

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2 Comments

Sulthan Over a year ago

I didn't know this, it surprises me that this works.

Shane D Over a year ago

Super. I did not knew about the limitations. I was returning Any from my subscript. This works

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